I can sort of understand the built-in GPS (although it does not really appeal to me), but built-in wi-fi?
If you can tether it wirelessly, that could be cool. I'm not so much thinking of studio, but loooooong exposures and/or time lapses could be interesting. Exposure bracketing beyond what the camera allows, etc. Pretty much anything you need the USB cable for.
... and why would you be using the 6D in a studio?
Not sure I see why not. That's probably the one situation where the AF wouldn't be relevant. I mean, medium format cameras are not known for their awesome autofocus.
Yes, it doesn't have a PC sync port, but then you get these adapters that you put on the hot-shoe that gives you a port. In the dark days when I was between two DSLR's, I used one of those to do off-camera flash with my G9.
Surely then you would want something that does not force you use focus-and-recompose?
You would think that. But if you spend some time reading the 5D forums on dpreview, you'll find a stupidly large number of people who believe that "center-point focus, recompose" is how real photographers do it. Probably because they've never owned a camera that does a decent job of focus on anything other than the center point. The 40D/50D's AF is better than the 5D/5D2's AF in every way. It's cross type all round, it has a better spread, it's faster, it's a heck of a lot more accurate, particularly on the outer points.
I understand that maybe, at the time of the original 5D, it being based on the 10D or 20D, that that AF system might have been acceptible for mid-range body. But the 5D2 is based on the 40D. That they didn't at least use the 40D's AF system is unforgiveable.
OK, I'll get off my soapbox now.
